Power-transmission device.



No. 849,051. PATENTED APR. 2, 1907. A. G'HURGHWARD. POWER TRANSMISSION DBVIGB.

APPLIOATIUNIILED SEPT-6. 1902.

73 k 27 o as c1 1 Mi 9 l6 h 2; no a9 'lllmmm I 4 Witnesses- 5p Inventor:

J lexandePChu'rchv/var'd bH-MOZZM {UNITEDgSTAIES PATENT OFFICE.

fALEXA pEaQIaURoHWA D,or PELHAM, NEW YORK, ASSIGNOR 'ro- GENERALELECTRIC'COMPANY, A CORPORATION or NEW YORK.

Ne'iiv lY'ork', have invented certain new and useful Improverneiits in Powe Devices, of which the followi 11g} 'suoll its the ordinary "11 ofala'rge flna iler one at k,'tli pressure be the'disks, if I J I, A iently great to n-eve'nt slipping at the heath-st load earrig As a. result. loadsfis greater t 'Iri' "friot i on ge' speed-regulating dtskfldriving' or d tween the coarsestau tion of ni 1S 'xv'lio'reby the p1 ssur'e between lrt tron g tiring will be 'autoniat-icallv varied in" accordance 1' the. l ath I in the acco .myingih-n' ng s l igure 1 illustrates one. eliilJodJlii ultt'ol my nvention.

Fig. Bis a view, partl 111: seetion;illustrating a somewhat (llfl t iftillijiol lll ftvhi le '11 1g. 3, also partlym section, illustrates aur -d tor1n.

in, Fig. 1' a direct-current,shuntqvound electric motor 1 of ordina Construction is shown. v The driving-swiftfol"the inotor earries a pulley -2,'wh ieh belt-eonneeted ,to a. lpulley 3 mounted outhe 'sha'l't 4. 'lhe pulis rotatably held in tlufljournal-boxes a; (olvlars 7 are lornufdon the slee've and are lo: ciatrd lmhver v 'lngrend plat ol the pulle the bearings. ,6 thus prereut- The sleeve 5 .15

Spllllttlifl tluislia-l't 1 insueh nia'nnerthattlii two 'turn together ln tare i apable of movement longitud nally. of one another.

A disk 1 ll rigidlv' mounted at one end of "the haft ib'ettt'e'ena pair of parallel disks 11 and 1;. whieli have their axfes iii line with one a-notl irr and at rigl iit anglestothe shaft 4. The disk 12 'is rigidly scouredtoono end The other end of the shaft 13 carries.a 'spu'r-gear. H o lo' th er suitable; oon-.

lieetiou l'ordriving. the njieoh'anisni ,ivhich is ot thi' the l ri ion at light.

Specification of Letters Patent.

' the. lield of the motor.

"POWER-TRANSMISSION DEVICES Patented April2,1907.

Appliuittion fileii September 6, 1902. Serial No. 122,382,

ported in the bearing and is also placed between the disks 11 and 12, with its axis in. line with the. axis of the. disk 10. The disks 11 and 18 are idlers and are used merely toprovent lateral stress on't-he shaft-s 4 and 13. The disks 10 and 18 may be made of paper, while the disks 11 and 12 may be inadeof east-iron. Other suitable materials. can be employed.

liigidly secured to the shaft 13' between the disk 12 and journal-box 15 is a grooved wheel 21. A lever 22. perpendicular tothe shaft 13, is pivoted at 23 and is plaeedxvith one end 24 engaging the walls of the grooved disk 21. The other end of this lever is placed in front of the electroinagnet .26 and carries an armature 25 to be attracted by the electromagnet; 'lh'e eleetroniagnet 26 'is'plaeed parallel to the shaft 13. and its roils are lorated in the rurrent-earrving line 27. .Ilhe lines '37 and 3S suppl v eurrent to the armature of the motor. Lines 39 carry Current to A grooved disk 30 i mounted on the endof the shaft 4 opposite to that carrying the disk :10. leveriil; pivoted at 3'2 to the i'raiueivork ol' the l11:l(l1l1\(,l1:1$ one end in engagement with the disk St The lever 31 and disk 30 lorm means for adjusting the shaft 4 endwise to vary the relative speeds of the shafts -laudlit.

'lhe operat ion ol the eonstl'ltttioli described s as l'ollows: 'lho rotation of the motorshalt through the pulleys 2 and 3 rotates. the shalt 1. This l) means of the disks l0 and 12 turns the shalt 1:1. The speed at which the shal'ik ili-is-turned varies inverselv \vith lli(" tll lt1ll(t ol' the disk 1t) l'roni the axial eenter ol' the shalt 13. The passa;:i, l of the irurrent tlu'oughfthe inotor-arimitnre enerlgizes the elertroiuaguet 2o, which in turn attract-s tho ultiiilitllt 253 and tends tolurn the lever v tween the disks 10 mar 12; yvhi ehl \vas originally' very slight. is thus iiirreased; r-The force with \vhirh the armature 25 s attracted, and'luau'e the pressure betvveen the, disk 12 22% about its pivot. 'lhe pressure bea idlhe disk .10. inereases rith the rui rent in V the line 21.1..1 110Current. in turn, however, varies with the load upon the inot't, l i is well kammw tlugisejskilledin"the a t therefor-ellhat the pressure betii'een the disks 10 and htvaries \vit'lt tlio,

load upon the motor-shaft.

' tor.

varies with the, loadon the motor, no real epare located adjacent the disk-bearing end of -disk, except when theelectromagnet "26 or .load. a a

In the construction shown in Fi 2 the, shaft 4 is provided at its inner end; with a small integral disk 33 and has an axial opening 34 formed in itsend. In this axial opening or channel a guiding stem or,pin 35 is placed. To the outer end'of the pin 35 is rigidly secured adisk 36, similar in size to the disk 33. Between .the disks 33- and 36 a disk 37,'of yielding material, is placed. The disk 37 may be made out of rubber or other suit-- li-ble material andfis rigidly secured to the disk 33. In this form the coils 26 surround the shaft-'4, which turns in them. "The coils the shaft 4, the end of the pin 35 being located about midway of the coils.

On'\ the passage ,of the motor-current through the line 27 and the energization of the electromagnet 26' the disks 33 and 36 are drawn toward one another. a This compresses the elastic disk 37, and hence enarges its diameter. Asa result in this case also the friction between the disk 37 and the disk 12 varies with the current passing in the line 27, and hence with the load on the me- In the form of my invention shown in Fig. 3 the electromagnet 26 is placed between the disks 11" and 12'on prolongation of the shaft 13,.and the energization of the electromagnet tends to draw the disks Hand 12 togeth'e'r. i

It will be readily apparent that in all of the forms of my invention disclosed the operation of the apparatus is-independent of the direction of-rotation of the motor-shaft and that the reversal of the direction of rotation of the motor-shaft will cause areversal of the direction of rotation of the rlriven shaft. I i

As the pressure between the driving-disk and the driven disk in all the forms of my invention specifically illustrated and described erative or active engagementexistsfbetween a driving-disk and to cooperating driven 26- ispnergized, as otherwise pressure" between the disks is too slight to transmita'ny VVhile'Ihave-illustrated-and described the best forms of my invention whichare now known to me, I do not'intend to beslimited to the exact construction disclosed, and many variations of structure and arrangement may be made without departing from the spirit of my invention.

What I claimas new, and desire to secure by Letters Patent of the United States, is-

1. In combination, a motor, a friction their axes at frictlonally driving the other, and electro- -magnef1c means for automatically varying means for varying gears as the load on ally forcing them together with varying with the load transmitted.

energized by the current of the In combination, an electric motor, a

rent for axially hence increasing 'Wlfill a-pressure proportional to the friction-roller disk driven'thereby, another frictioil-dis];- n rolling engagement with the first, and "eler tromagnetic; means for automatically regudisks;

2. In combination, a pair of disks having right angles,' one of the disks the pressure between the disks with the power transmitted.

3. In combination, a frictlonal drivingin accord ance gear, a driven gear turning at a different rate of-speed from the driving-gear, and electromagnetic means for automatlcally varying the pressure between the disks in accordance with the power transmitted.

4. In combination, a motor, a shaft, a pair of friction-gears connecting the motor and.

the shaft, and automatic electromagnetic the motor'varies.

'5. In combination, a pair of friction-gears, and electromagnetic means for automatica pressure 6. In combination, an electric motor, a

pair of members having non-coincident axes,

bemgdriven by the moone of said members tor and frictionally drivmg the other, and means'operated by the current of the motor for forcing themembcrs together.

7. The combination of an electric motor, a

pair of friction-gears driven thereby, and an eleetroma net for varying the pressure bethe pressure between the tween sair gears, said electr'omagnets being motor. 8.

yielding material, and,

ameter. v 9. In com'blnatlon, apan of friction-gears,

.and electromagnetic means for automatic ally, forcing them together with a pressure varying with the loadtransmitted by the gears; I 10. The combination. of a frictiondisk, a

friction-roller placed tov engage the same,

withele'etromagnetic means for automaticfriction-disk driven thereby, said friction disk being madeout of clamping means operated by the motor-curcompressing-said disk and its i IOl ally forcing one of said parts toward the other ower transmitted by said parts, substantially as described.

11. The combination of a friction-disk, a

laced to engage the same, with electromagnetic means for automatically forcing the roller toward the disk with a pres-' sure proportional to the power transmitted through the said parts substantia lly as described.

, 12. The combination of a friction-disk,- a

with electromagnetic forcing the roller means is operated, substantially as describe 13. The combination of a friction-disk, a

friction-roller. normally out of active engagement with the same, driving and driven mechanism respectively connected to said two parts, said driving mechanism including electromagnetic means for automatically forcing the roller against the disk under operatin conditions, substantially as described.

14. n combination, a driving member, a

driven member in engagement therewith, and electromagnetic means for forcing the members together with a pressure roportional to the product of the speed Wit which the driving member moves into the retarding force exerted on it by the driven member.

15. In combination, a friction-disk, afric- 15 tion-roller normally out of operative engage-- ment with the same, driving and driven mechanism respectively connected to said diskand roller, and means controlled by the energiz'ation of the driving mechanism for 20 automatically forcing the roller into operative engagement with the disk.

In Witness whereof I have hereunto set my hand this 4th da of September, 1902.

ALEXAbl DER OHUROHWARD. Witnesses:

Tnos. K. HENDERSON, L. O. Foss. 

